John e



(No Model.) N

J. Ri ROWLANDS. 'm BOLT GUTTER. y

No. 307,229, l Patentedotqza; 1884;

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UNiTnn @Tartes ,Batteur Ormea.

JOHN B'. ROVLANDS, OF BROOKLYN, NEV YORK, ASSIGNOR TO THE J. G. lHOFFMAN MANUFACTURING OOWPANY, OF SAME PLACE.

BOLT-CUTTER.

v'3?ECIIFICIA'.{IOJ'\T forming part of Letters `Patent No. 307,229, dated October 28,1884.

Application iiled April i0, 1984. (No model.)

used, when desired, for cutting off metal wire or rods. ln a hand implement of this class there is usually a frame, at one end of which is rigidly secured a fixed cutter or knife, and in which is fitted a slide or plunger carrying a movable cutter or knife, the said slide or plunger being actuated by a pair of haudles pivotally connected with the frame, pref erably by means of links. the kind above described, which have been before used, the knives have commonly had at one side of t-he shank only a straight cutting-edge, and if such edge became broken by reason of great strain upon it, or by reason of being too hard, it has been rendered wholly useless unless the gap or iiaw could be ground out by a considerable expenditure of labor.

One important object of my invention is to provide a bolt cutter or trimmer in which the 30 knives or cutters are so formed' that in case that portion of the edge which is at' any time operative breaks down the knife can be readily adjusted to bring a sharp and unused portion of the edge to a position for` use; and a further object of the invention is to afford more adequate support tothe knives or cut ters and prevent them from tilting up or cant ing while in operation t'o an extent which will render them liable to break. 4o In the accompanying drawings, Figure l is a plan of a bolt cutter or trimmer embodying my invention. Fig. 2 is a longitudinal section thereof.' Fig. 3 is a transverse section on the dotted line x Fig. 1; and Fig. 4 is a 45 similar section on the dotted line y y, Fig. l.

Similar letters of reference designate corresponding parts in all the figures.

A designates the frameof the tool, which may be of cast metal, and which is of approxi- 5o mately V-shaped form, but closed at the back.

In this frame is fitted a slide or sliding plun- In the cutters of ger, E, which has ribs b," fitting grooves or ways a on the inner sides of the frame A, whereby said slide or sliding plunger is properly guided and prevented from canting during its movements.

O O designate the operatinghandles,which are connected by pairs of links D D with the ends of the frame A, and which haveinwardly-projecting lugs or ears c c'done formed upon each-between which is fitted and to which is pivoi'ally connected the slide or plunger B.

Frein the above description it will be apparent that when the handles are separated the slide or plunger B will he drawn back or partly ont of the frame A, while the bringing of the handles together will move or force the slide or plunger inward in the frame.

On the handles C O are projections d,which form stops to limit the inward movement of the slide B.

lu the back of the frame A isa slot orslightl y-elongated opening, e, which receives the bolt or piece of metal to be cut oli' by the knives or cutters, one of which is stationary or adjustably iixed in the frame, and the other of which. is similarly tixed in the slide or plunger B. These knives or cuttersl will now describe.

E designates thexiixed or stationary knife, and lil designates the knife which is carried by the movable slide or plunger B. Each knife has a shank, j", lwhich is preferably eylindric and of comparatively small diameter, and above the shank vl'lares outward to form a c'uttingedgeft, ofapproximately circular form and comparatively large diameter.

ln the end portionof the frame A isasocket, g, into which the knifeshank f is iitted, and above the said socket is a downwardlytapering or upwardly and outwardly flaring seat, g', in which is supported the tapering or conical portion below the cuttingedge The knife E is secured by a screw, h, which has a taper head, 7i', and which is screwed into a threaded hole, t, at the bottom of the shanksocket g, and, if desired, the screw might project beyond the back of the frame and have applied to it a l0ck-nut for holding the screw against becoming loose.

In lieu of the screw 71, tapped into the frame IOO A, l. may employ a bolt passing through the frame and secured by a nut at the back. The shankf of the knif'e E is fitted in a socket, j, in the inner end portion ofthe slid-e or plunger B, andthe portions of the traine A adjacent to the slideway for the slide or plunger are beveled or flared outward at '/r, so as to support the conical or tapering portion of the knife E', which is below its cutting-edge iii The knife E is secured by ascrew, Livhich has a conical or taper head, Z, and which passes snugly through the knife and is screwed into a tapped hole in the slide.

The knives, when shaped and supported as above described, have little tendency to cant, and hence their cutting-edges il: :i: are always kept in the same plane; but their great advantage lies in the fact that their cuttingedges are continuons, and if the edge of either knife breaks down or is ilawy at any point its securing-screw may be loosened, and by slightly turning the knife a new edge portion brought into position for use, aiter which the screw is tightened to hold the knife rigid. The knives are so large in diameter that the curvature of the cutting edge does not prevent them from operating properly; but in case it is desired, the edge, instead of being` truly circular, may be polygonal or manysided-that is at eight or ten points in its perimeter its edge may have for a short distance a straight profile.

Vhat I claim as my invention, and desire to secure by Letters Patent, is-

l. In a bolt-cutter, the combination, with a frame, aslide iitted thereto, and handles for operating the said slide, of a knife carried by the said slide, and a knife having an ap-A proximately circular cutting-edge adjustably secured in said frame, and capable of being turned to present different portions of its edge for use, substantially as herein described. 2. The combination, with a frame, a slide fitted thereto, and handles for operating the slide, of a knife fixed in thefraine, and aknife having an approxin'iately circular cuttingedge adj ustabl y secured in said slide, and capable of being turned to present diiierent portions oi" its edge for use, substantially as herein described. l 3. In a bolt-cutter, the combination, with a frame and a slide litted thereto, of knives having approximately circular cutting-edges adjustably secured in said frame and slide, and capable of being turned to present different portions of their edges for use, substantially as herein described.

ft. The combination, with the frame A, having` the socket g and the flaring seat g', of the knife E, having the shankf, fitting said socket, and the conical portion below its cuttingedgc fitted to said seat, the securing-screw li, and the slide B,tittcd to said frame and carrying a knife for operating in conjunction with the knif'e E, substantially as herein described.

5. The combination, with the frame A, provided at the inner end with a knife, and having the beveled or flaring surfaces k, of the slide B, iitted to said frame and having in it the socketj, and the knife E, provided with the shank j", fitted to said socket, and the tapering or conical portion below the cuttingedge bearing on the frame-surfaces le, and the securing-screw Z, all substantially as herein described.

JOH R. ROWLANDS.

Vi t n esses FREDK. HAYNns, IiLvrri-ri-:W loLLoCK. 

